Recall the formula for the perimeter (circumference) of a circle.

March 30, 2026Mathematics

ScanSolve AI Answer

March 30, 2026

Answer

66 cm

Step 1: Recall the formula for the perimeter (circumference) of a circle. The circumference $C$ of a circle is given by the formula: $C = \pi d$ where $d$ is the diameter of the circle.

Step 2: Substitute the given diameter into the formula. The diameter $d = 21 \text{ cm}$ . We will use the approximation $\pi = \frac{22}{7}$ . $C = \frac{22}{7} \times 21 \text{ cm}$

Step 3: Calculate the circumference. $C = 22 \times \frac{21}{7} \text{ cm}$ $C = 22 \times 3 \text{ cm}$ $C = 66 \text{ cm}$

The perimeter of the circle is $\boxed{66 cm}$ .

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Recall the formula for the perimeter (circumference) of a circle. The circumference C of a circle is given by the formula: C = d where d is the diameter of the circle.

Asked on March 30, 2026Mathematics

This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

ScanSolve AI AnswerAnswered on March 30, 2026

Step 1: Recall the formula for the perimeter (circumference) of a circle. The circumference C of a circle is given by the formula: C = d where d is the diameter of the circle. Step 2: Substitute the given diameter into the formula. The diameter d = 21 cm. We will use the approximation = (22)/(7). C = (22)/(7) × 21 cm Step 3: Calculate the circumference. C = 22 × (21)/(7) cm C = 22 × 3 cm C = 66 cm The perimeter of the circle is 66 cm.